Web notes
Substrate Check
A practical pressroom note on substrate checks for converters who want steadier ink and registration from the first reel.
Before a reel reaches the unwind, it helps to confirm the basics: width, gauge, surface treatment, core, and how the material has been stored. Substrate Check is our note for teams avoiding preventable trouble on flexo jobs.
Substrate Check stays close to what the reel tells the press team before ink is mixed. We look at width, gauge spread, treatment level, core size, winding quality, and storage condition, because those points affect tension, register, and ink hold-out on packaging work across Gauteng, KZN, and the Western Cape. If you want to discuss a reel issue or a repeat fault, use the contact form and include the material type, press style, and the point where the problem starts.
Reel checks before the unwind
- Reel width verified against job card
- Surface defects photographed at the reel edge
- Treatment reading or mill reference noted
- Material name, supplier, and gauge recorded
Substrate behaviour changes what a CI press, narrow-web line, or stack press will tolerate, so the material check should be read with the machine path in mind.
How Substrate Check shapes film, paper, and board jobs
Substrate Check looks at the basic reel and material checks that support steadier printing from the first run. Confirming surface condition, winding quality, width, and consistency helps with ink laydown, tension control, and register.
Begin with the actual substrate and intended pack format. PE, BOPP, paper, and folding box board each bring different tension, treatment, and ink-transfer considerations, and South African storage conditions from Johannesburg to Durban can shift how the reel behaves on day one. Job width, repeat length, and ink system should be considered before the first splice reaches print.
The first inspection is best done at the reel stand, not after the web breaks. A short written check near the machine helps operators compare incoming reels, note telescoping or crushed cores, and stop a poor roll before it creates waste through the line.
What the note helps isolate
Substrate Check points out the simple material issues that often get blamed on plates, ink, or operator settings. Teams can use it to separate a treatment problem from a tension problem, or a winding defect from a register drift that only appears after speed increases.
Use Substrate Check with the linked notes before widening the fault search. If a reel has travelled through Durban or inland warehousing, compare the delivered material against the specification, storage record, and the condition seen at the unwind.
- Checks matched to film, paper, or board
- First reel condition noted before mounting
- Core, splice, and winding faults listed
Material conditions on South African sites
Substrate handling changes with where the job runs and where the reels were stored. Inland dry conditions can build static on film, while coastal humidity can alter paper behaviour, so the note keeps attention on storage time, wrapping condition, and whether pallets stood in a controlled area or near open loading points.
Dust, temperature swings, and power interruptions all show up differently once the web starts moving. A reel that looks acceptable in the store can still track poorly after a stop-start shift pattern, especially when edge damage, uneven winding, or low treatment only become visible under running tension.
Operated by Astros Marketing (Pty) Ltd from 2 Makro Place, Sunnyrock 1401.
Key points inside Substrate Check
A practical pressroom note on substrate checks for converters who want steadier ink and registration from the first reel.
Keep this note with the job record while the reel label, purchase paperwork, and press settings still match the run. It is useful when the same material returns for repeat work and the team needs to compare gauge, treatment, storage history, or recurring unwind faults against earlier production notes.